Skip the auto shop - Our mechanics make house calls

Q: I replace my ecm cranks once but won't start

asked by on

I replaced my ECM and now it cranks over once but won't start. Then if I was to try and start it for the 2nd time, it won't do anything. Not sure what it could be
My car has an automatic transmission.

Hi, thanks for writing in. There are a number of systems that your ECM controls. Be sure you are getting power to all of your critical components like fuel pump, injectors, coil packs, etc. Check to see if when cranking the car gets fuel. Do this by cranking it and then pulling a spark plug out to see if it is wet with fuel. Next check things like crank and cam sensors as these can cause the car to not produce a spark when not functioning properly as they contribute to proper timing.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I replace my ecm cranks once but won't start

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Truck runs fine most of the time but sometimes when its raining it won't crank and there is no noise at all.

Hi and thanks for contacting Your Mechanic. For the no start situation that you are encountering, check the wiring to your starter and make sure that the wires are tight and clean. If the wires are clean, then check the...

Q: Is Check Engine on because of the AC? 2003 Chevy Silverado

Hello - it is not likely that the AC is setting the Check Engine Light on. The only way to know why the Check Engine is on is to have the problem codes read. Most auto parts stores will read...

Q: Transmission leaking from the inside

Hi. The axle seal sits in the transmission where the axle shaft slides in. I'm assuming that is what your mechanic is talking about, or the axle shaft sleeve. In either case, this is a fairly routine repair. First, the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.